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  • Users: MJR2
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  1. MJR2

    Magnetic separator

    An electromagnetic drum is not likely an improvement over what he has. In the sizes of ferrite drums typically used for aggregate processing an electromagnetic solution is not available. What you will be considering is a drum made with rare earth magnets. There are at least two different RE...
  2. MJR2

    Using an electromagnet to disengade a permanant magnet?

    What you have sketched will not work. There used to be a product called FailSafe that did what you want. They don't seem to list it on their website any more. A PM product called Safehold can be motorized to drop the object. Alternatively use a battery backup to power your electromagnet. Mike
  3. MJR2

    Electomagnetic discharge

    If you don't have a drain for the current the voltage spike will eventually cause a winding failure in your magnet. And eventually can be a rather short amount of cycles. We have them integral on 40 watt lift magnets. Mike
  4. MJR2

    Electomagnetic discharge

    Drop controllers are used with lift magnets of all sizes. Particulary in rather automated systems. This particular brand I have no experieince with. Hubbell also has some. Some controls actually drive the magnet negative to discharge/drop faster. Safe? Never had what I thought of as safety...
  5. MJR2

    Electomagnetic discharge

    What you might want is a drop controller. Perhaps like one of these. http://www.ecandm.net/products.aspx?category=LiftingMagnetControllers Mike
  6. MJR2

    High temperature colenoid coil

    Look at anodized aluminum strip. Mike
  7. MJR2

    540 or 1000 pto

    The equipment you are running is designed for 540 or 1000 rpm. Running a mower or blower designed for 540 at 1000 is not a good idea. Your Dad was running the tractor engine slower to save fuel. So the output speed was the same. The slower running engine had less power so it stalled under load...
  8. MJR2

    Best Gyratory Crusher Feeding Scheme

    If you have modified the feeder without the manufacturers assistance you may have reduced it's effectiveness. These types of feeders are tuned to the weight of the tray and base. Adding weight to the tray with the steel plates can cause yourself more problems. Often a large magnet is placed...
  9. MJR2

    Best Gyratory Crusher Feeding Scheme

    What have been the problems with the feeder? What is your required capacity? Mike
  10. MJR2

    Agricultural building - loads

    The orders in my barn is stack it so it doesn't touch the roof. We are definitly stacking ten layers high. I have seen it much higher in some barns. The farmer and engineer in me conflict on this subject. I've only been doing this the last fifteen years of this barn's 110 year life. So it is not...
  11. MJR2

    EMS Magnetic software

    Another vote for Magnet by Infolytica. Use it daily for over 20 years. Mike
  12. MJR2

    Which FEA should I use for solenoid calculations?

    Infolytica is running a 2D solution while I'm typing this. I've used Magnet since the days of '286 and only 2D. Often (but not always) transient solutions can be done in a step wise 2D fashion. We did a lot with 2D when it was all we had. Mike
  13. MJR2

    FEMM - What's wrong with this picture?

    Do you want to move them or flocculate them, the nano particles. If you look up the spec for the probe you hvae used and then make a running average of your FEA results you will find the answers closer together. In general having learned how to use FEA to give me results I can measure I no...
  14. MJR2

    Ceramic 5 / Ferrite magnets -- possible leeching

    While ceramic magnets are generally considered to resist corrosion heated deionized water mixed with hydrogen gas would be rather agressive. I'd lean towards the magnets 'rusting'. What is the resistivity of your deionized water when you start? Mike
  15. MJR2

    FEMM - What's wrong with this picture?

    I suspect you are not actually measuring or reporting the vectors or vector sum quite the way you think you are. Similar to what would happen with a unidirectional probe that is not rotated to find a peak or perpendicular to the flux lines. Mike
  16. MJR2

    Ferrite electromagnets

    Magnetic levitation is very unstable. As you have begun to understand the response time in your electromagnets is an issue. There is only going to be one 'sweet' spot here and the forces that want to move the object out of that are much faster than your electromagnets can respond. Mike
  17. MJR2

    magnetic standards

    One of my qualifications of a vendor is if they can provide a decent B-H curve with temperatures. If they ask me what that is we do not need to continue the conversation. Any good vendor as MagMike suggests can provide the curves. Mike
  18. MJR2

    Magnet Temperature Compensation??

    Your steel saturates from the flux generated by the permanent magnet. I believe you can see that in the FEMM solution you posted. Although I don't know the scale value of the colors shown. A curve for 1018 steel will begin to show saturation at maybe 16000 gauss and start getting serious at...
  19. MJR2

    Magnet Temperature Compensation??

    Thermoflux is a soft magnetic material not a PM. Not saturating the magnet but saturating the steel circuit. If the steel is saturated then as temperature effects the PM the resultant field changed is muted. In other words the steel carries only so much flux. And changes in the generated flux...
  20. MJR2

    Magnet Temperature Compensation??

    All the common magnet materials have a temperature coefficient much greater than your spec. Do you have a link to the Thermoflux Sheets. Google didin't turn up anything that made sense to me. One technique to reduce the effect of the magnet changing with temperature would be to saturate your...

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